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12=15-p

We move all terms to the left:

12-(15-p)=0

We add all the numbers together, and all the variables

-(-1p+15)+12=0

We get rid of parentheses

1p-15+12=0

We add all the numbers together, and all the variables

p-3=0

We move all terms containing p to the left, all other terms to the right

p=3

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